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Letters .Patent No. 81,778, dated Septemberrl, 1868.

IMPROVEMENT IN SUBMBRGED ROTARY PUMPS.

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To ALL WHOM ITMAY concessi y Be it known that I, DEXTER D. HARDY, of Cincinnati, in the county of Hamilton, and State of Ohio, have invented a. new and useful Improvement in Pumps, of which the following is a full and clear description, reference being hadto the accompanying drawings, making part of this specification.

The nature of my invention consists in a novel construction of a rotary pump, whereby the rotating pistons are arranged to be submerged, and are operated by a vertical rod, extending up through or by the side of the pipe connecting them with the hydrant or case above ground, as hereinafter explained.

Figure iste. vertical section -oi" my improved pump in position, ready for operation,

Figure 2 is a transverse section through the pistons and case,

Figure 3 is a top plan view of the piston-case, and

Figure 4 is aside and top plan view of a modiiicatiou of the same.V

It has hitherto been customary to construct rotary pumps having two rotating pistons enclosed in a case, located above the'surface, and connected by a tube with the water in the well or cistern below. Pumps thus i constructed are objectionable for two reasons: first, that they are liable to 'freeze up, and thus become useless in the winter time; andsecond,bccause the water, b'eing lifted by suction, it is difiicult to keep the pistons and case sufficiently tight to form the necessary vacuum, especially when worn, and-where the water has to be lifted to any considerable height. l

It is to remedy these difliculties, and produce a pump that canv be used'at all times and in all situations, that is the object of my invention.

To make'mv im roved um I rovide two istons, G and G', havincr teeth or dan es z' ro'ectin radiall I P P P P P D g P .l g y and arrange them in a suitable case, F, in such a position that, as they rotate, their teeth or iianges will interlock like the teeth on gear-wheels, as shown in iig. 2, and as is customary in this class of pumps." These pisi tons are' journalled in the heads of the case, with their ends fitting snugly against the heads, but not so tight as to interfere with their rotation. In each ond of the case Fis a vertical rectangular recess, L, as represented in iig. 2, hnd in these'recesses'arc fitted packing-blocks O, having their inner faces curved to correspond with periphery of the pistons. Set-screws y are inserted through the ends ofthe case F, with their inner ends bearing against the rear faces of the blocks O, by which means thebloeks are adjusted to compensate for any wear, and be kept close up to the flanges of the pistons. -A series of holes, 7i, serves to admit the water on one side of the case, from whence'it is carried through between the pistons to their opposite side, from whence it rises to the top ofthe case, into a channel orreccss, ol, in the under side of the upper head, E, which leads to the outlet-pipe C, as represented in iigs. 1 and 8.

The operating parts of the pump being thus constructed, are to be submerged, and are connected by a pipe, 0, with thev hydrant '13, secured upon a platform, A, over the well or cistern, as clearly shown in fig. 1.,

To operate the pistons, I connect a rod, II, to one of the pistons G, and extend it up through the pipe C, and through the hydrantB, and secure to its vup `end a hand-wheel, I, having a handle, f, attached.

Or, if preferred, ther rod II may be connected to thc other piston, G', and extend up outside of .the pipe, as represented in fig. 4, there being bearings, R, attached at intervals, to hold the rod steady, and in place. It is also obvious that, if desired, a bevel-pinion may be attached to the top of the rod, H, and geared into a vcorresponding bevel-gear, placed ona horizontalA shaft, having an ordinary cranlcattached for operating it, but this is more expensive, and therefore not considered preferable. In case the rod be located outside ofthe pipe, it may extend up outside of the hydrant, especially if the bevel-gear be used, but the plan represented in fig. 1 is the simplest and cheapest.

The pipe C is intended to be sufficiently rigid and strong -to support the operating parts, and to hold them.Y in position, without the aid of the framing generally used in other styles of submerged pumps.

It will thus be seen that, with a. pump constructed and arranged as described, it cannot freeze, as thc operaims ating parts are constantly submerged, und the ratei-,left in the pipe immediately Hows back, and escapes, the Weight of the water causing the pistons to turn back suilicient-ly to pei-mit its escape. At the same time, the pistons being submerged, force the Water np the pipe, instead oi' lifting it by creating a vacuum, and hence do not need to work or tit es snugly es in those having the pistons placed above.

Hoving thus described my invention, what I claim, is-

A pump, consisting of the case, F, with the pistons G enclosed therein, connected by the pipe C with the hydrant B, and operated by the rod H, all substantially es described.

DEXTER D. HARDY. Witnesses:

C. L. Fisnnn, A. T. BUTLER. 

